Energy pile field simulation in large buildings : Validation of surface boundary assumptions

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en Ferrantelli, Andrea Fadejev, Jevgeni Kurnitski, Jarek 2019-04-02T06:57:19Z 2019-04-02T06:57:19Z 2019-02-26
dc.identifier.citation Ferrantelli , A , Fadejev , J & Kurnitski , J 2019 , ' Energy pile field simulation in large buildings : Validation of surface boundary assumptions ' Energies , vol. 12 , no. 5 , 770 . en
dc.identifier.issn 1996-1073
dc.identifier.other PURE UUID: c5e88a6b-f9ec-414a-8b75-746a83b5f0a6
dc.identifier.other PURE ITEMURL:
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dc.description.abstract As the energy efficiency demands for future buildings become increasingly stringent, preliminary assessments of energy consumption are mandatory. These are possible only through numerical simulations, whose reliability crucially depends on boundary conditions. We therefore investigate their role in numerical estimates for the usage of geothermal energy, performing annual simulations of transient heat transfer for a building employing a geothermal heat pump plant and energy piles. Starting from actual measurements, we solve the heat equations in 2D and 3D using COMSOL Multiphysics and IDA-ICE, discovering a negligible impact of the multiregional ground surface boundary conditions. Moreover, we verify that the thermal mass of the soil medium induces a small vertical temperature gradient on the piles surface. We also find a roughly constant temperature on each horizontal cross-section, with nearly identical average values when either integrated over the full plane or evaluated at one single point. Calculating the yearly heating need for an entire building, we then show that the chosen upper boundary condition affects the energy balance dramatically. Using directly the pipes’ outlet temperature induces a 54% overestimation of the heat flux, while the exact ground surface temperature above the piles reduces the error to 0.03%. en
dc.format.extent 20
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher Multidisciplinary Digital Publishing Institute (MDPI)
dc.relation.ispartofseries Energies en
dc.relation.ispartofseries Volume 12, issue 5 en
dc.rights openAccess en
dc.subject.other Renewable Energy, Sustainability and the Environment en
dc.subject.other Energy Engineering and Power Technology en
dc.subject.other Energy (miscellaneous) en
dc.subject.other Control and Optimization en
dc.subject.other Electrical and Electronic Engineering en
dc.subject.other 212 Civil and construction engineering en
dc.subject.other renewable energy en
dc.title Energy pile field simulation in large buildings : Validation of surface boundary assumptions en
dc.type A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.description.version Peer reviewed en
dc.contributor.department Tallinn University of Technology
dc.contributor.department Department of Civil Engineering
dc.subject.keyword Computer simulations
dc.subject.keyword Energy
dc.subject.keyword Energy piles
dc.subject.keyword Floor slab heat loss
dc.subject.keyword Validation
dc.subject.keyword floor slab heat loss
dc.subject.keyword DESIGN
dc.subject.keyword HEAT-TRANSFER
dc.subject.keyword energy piles
dc.subject.keyword THERMAL-RESISTANCE
dc.subject.keyword PERFORMANCE
dc.subject.keyword BEHAVIOR
dc.subject.keyword computer simulations
dc.subject.keyword MODEL
dc.subject.keyword NUMERICAL-ANALYSIS
dc.subject.keyword validation
dc.subject.keyword energy
dc.subject.keyword Renewable Energy, Sustainability and the Environment
dc.subject.keyword Energy Engineering and Power Technology
dc.subject.keyword Energy (miscellaneous)
dc.subject.keyword Control and Optimization
dc.subject.keyword Electrical and Electronic Engineering
dc.subject.keyword 212 Civil and construction engineering
dc.subject.keyword renewable energy
dc.identifier.urn URN:NBN:fi:aalto-201904022511
dc.identifier.doi 10.3390/en12050770
dc.type.version publishedVersion

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